I see why people use downvoting this way, especially since that was the norm on reddit which a good portion of the base fled from, I find the same issue I had with downvotes on reddit to apply here as well though. I try to advocate down votes to be not out of personal opinion, but a reflection that the content is either useless or harmful to the existing conversation. This allows posts that are actually useful and contribute to the discussion to exist even if they are unpopular to peoples opinion. Just because you don't like the post, doesn't mean the post isn't true or useful, which is why I find that form of downvoting ideology to be harmful overall.

That being said, I would find the parent comment you replied to as constructive to the conversation...Up until they started egging people on with "is getting people super angry" I wouldn't call this being downvoted for not agreeing, I would call it being downvoted for not being constructive to the post at hand(as there's no need to actively try to get people to rage at you with a post like that)